SMS Guide

Messaging Service Specification

Ready to reach the world? Sinch makes it easy to send and receive SMS messages anywhere, quickly and reliably!

In this document

From one-way to two-way SMS, from marketing to verification, we’ve got you covered whatever your use case. Download our service specifications for SMS messaging to find out more about our products.

1-way SMS
2-way SMS
MMS
Number lookup
Load test

Related resources

Guides

Resources

Your Cookie Choices

When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
Cookie Statement

Strictly Necessary Cookies (always active)

These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work.
These cookies do not store any personally identifiable information.
Cookie details

Cookie Subgroup	Cookies	Cookies used
eu5.mm.sdi.sinch.com	ASP.NET_SessionId	First Party
community.sinch.com	AWSALB , LiSESSIONID	First Party
appengage.sinch.com	dd_cookie_test_	First Party
tickets.sinch.com	atlassian.xsrf.token , JSESSIONID	First Party
cockpit2.sinch.com	SESSION	First Party
engage.sinch.com	instapage-variant-xxxxxxxx	First Party
dashboard.sinch.com	cookietest	First Party
brand.sinch.com	PHPSESSID , AWSALBCORS	First Party
sinch.com	__cf_bm , OptanonConsent , TEST_AMCV_COOKIE_WRITE , OptanonAlertBoxClosed , onesaasCookieSettings, QueryString, functional-cookies, performance-cookies, targeting-cookies, social-cookies lastExternalReferrer, lastExternalReferrertime, cookies, receive-cookie-deprecation _gdvisitor, _gd_session, _gcl_au, _fbp, _an_uid, _utm_zzses, lpv	First Party
mediabrief.com	__cf_bm	Third Party
recaptcha.net	_GRECAPTCHA	Third Party
cision.com	__cf_bm	Third Party
techtarget.com	__cf_bm	Third Party

Performance Cookies

These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous.
If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookie details

Cookie Subgroup	Cookies	Cookies used
community.sinch.com	ValueSurveyVisitorCount	First Party
buzz.sinch.com	instap-spid.8069 , instap-spses.8069	First Party
appengage.sinch.com	_dd_s	First Party
sinch.com	AMP_TLDTEST , rl_page_init_referrer , rl_trait , _vis_opt_s , __q_state_dp56h9oqwhna9CoL , cb_user_id , __hstc , rl_anonymous_id , rl_user_id , initialTrafficSource , _vwo_uuid , _vwo_uuid_v2 , rl_page_init_referring_domain , _hjIncludedInSessionSample_xxx , apt.uid , __hssrc , test_rudder_cookie , cb%3Atest , __hssc , rl_group_trait , _hjAbsoluteSessionInProgress , _vwo_referrer , _vwo_sn , _vis_opt_test_cookie , _hjFirstSeen , _hjTLDTest , _hjSession_xxxxxx , s_sq , _vwo_ds , rl_group_id , _vis_opt_exp_n_combi , s_cc , _gclxxxx , cb_anonymous_id , cb_group_id , apt.sid , rl_session , _uetvid , AMP_899c7e29a9 , _hjSessionUser_xxxxxx	First Party
brand.sinch.com	AMP_TEST	First Party
engage.sinch.com	no-cache , instap-spses.85bb , instap-spid.85bb	First Party
www.sinch.com	d-a8e6 , s-9da4	First Party
nr-data.net	JSESSIONID	Third Party
sinch-en.newsroom.cision.com	_ga, _gid	Third Party
sinch.in	_ga_xxxxxxxxxx, _gat_UA-XXXXXX-X, _gid, _ga	Third Party
terminus.services	terminustb	Third Party
g.fastcdn.co	instap-spses.85bb	Third Party
hello.learn.mailjet.com	pardot, visitor_id, visitor_id#####	Third Party
www.googletagmanager.com	userId	Third Party
hello.learn.mailgun.com	visitor_id#####, visitor_id	Third Party
dev.visualwebsiteoptimizer.com	_vwo_ssm	Third Party
box.com	box_visitor_id	Third Party
app.box.com	z, cn	Third Party
sinch-tfn.paperform.co	laravel_session	Third Party
go.sinch.in	visitor_id#####, visitor_id	Third Party
Qualified	__q_local_form_debug	Third party
Rudderstack	rudder.inProgress, rudder.3156dd1f-7029-4600-ae54-baf147d9af20.queue, rudder.3156dd1f-7029-4600-ae54-baf147d9af20.ack, rudder.3156dd1f-7029-4600-ae54-baf147d9af20.reclaimStart, rudder.3156dd1f-7029-4600-ae54-baf147d9af20.reclaimEnd,	Third party
6sense	_6senseCompanyDetauls, _6signalTTL	Third party
Appcues	apc_local_id, apc_user	Third party

Targeting Cookies

These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device.
If you do not allow these cookies, you will experience less targeted advertising.
Cookie details

Cookie Subgroup	Cookies	Cookies used
investors.sinch.com	visitor_id	First Party
community.sinch.com	VISITOR_BEACON , LithiumVisitor	First Party
sinch.com	_uetsid , ajs_user_id , _gcl_aw , ajs_group_id , AMCV_ , __utmzzses , _fbp , _gcl_au , AMCVS_	First Party
go.latam.sinch.com	visitor_id##### , pardot	First Party
linkedin.com	li_gc, bcookie, lidc, AnalyticsSyncHistory, UserMatchHistory, li_sugr	Third Party
pi.pardot.com	lpv151751, pardot	Third Party
hsforms.com	_cfuvid	Third Party
google.com	CONSENT	Third Party
sinch.in	_gclxxxx, _gcl_au	Third Party
www.linkedin.com	bscookie	Third Party
bing.com	MUID, MSPTC	Third Party
www.facebook.com		Third Party
hello.learn.mailgun.com	pardot	Third Party
www.youtube.com	TESTCOOKIESENABLED	Third Party
dev.visualwebsiteoptimizer.com	uuid	Third Party
g2crowd.com	__cf_bm	Third Party
pardot.com	visitor_id#####, visitor_id	Third Party
tracking.g2crowd.com	_session_id	Third Party
hubspot.com	__cf_bm, _cfuvid	Third Party
doubleclick.net	test_cookie, IDE	Third Party
youtube.com	CONSENT, VISITOR_PRIVACY_METADATA, VISITOR_INFO1_LIVE	Third Party
go.sinch.in	pardot	Third Party
liadm.com	lidid	Third Party
www.google.com	_GRECAPTCHA	Third Party

Functional cookies

These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies, then some or all of these services may not function properly.
Cookie details

Cookie Subgroup	Cookies	Cookies used
portal.sinch.com	pnctest	First Party
partner.appengage.sinch.com	_dd_s	First Party
investors.sinch.com	First Party
community.sinch.com	LithiumUserInfo , LithiumUserSecure	First Party
tickets.sinch.com	selectedidp	First Party
engage.sinch.com	ln_or	First Party
cockpit2.sinch.com	CSRF-TOKEN , NG_TRANSLATE_LANG_KEY	First Party
sinch.com	apt.temp-xxxxxxxxxxxxxxxxxx , hubspotutk , ajs%3Acookies , cf_clearance , ajs%3Atest , __tld__ , __q_domainTest , pfjs%3Acookies , ajs_anonymous_id	First Party
auth.appengage.sinch.com	AUTH_SESSION_ID , KEYCLOAK_3P_COOKIE , KEYCLOAK_3P_COOKIE_SAMESITE , KC_RESTART , AUTH_SESSION_ID_LEGACY	First Party
www.recaptcha.net	_GRECAPTCHA	Third Party
boxcdn.net	__cf_bm	Third Party
d2oeshgsx64tgz.cloudfront.net	cookietest	Third Party
sinch-np.paperform.co	XSRF-TOKEN, laravel_session	Third Party
vimeo.com	__cf_bm, vuid	Third Party
sinch-ca-sc.paperform.co	XSRF-TOKEN, laravel_session	Third Party
box.com	site_preference	Third Party
app.box.com	bv	Third Party
sinch-tfn.paperform.co	XSRF-TOKEN	Third Party
cision.com	cf_clearance	Third Party

Social media cookies

These cookies are set by a range of social media services that we have added to the site to enable you to share our content with your friends and networks. They are capable of tracking your browser across other sites and building up a profile of your interests. This may impact the content and messages you see on other websites you visit. If you do not allow these cookies you may not be able to use or see these sharing tools.
Cookie details

Cookie Subgroup	Cookies	Cookies used
community.sinch.com	ln_or	First Party
sinch.in	_fbp	Third Party
youtube-nocookie.com	CONSENT	Third Party
youtube.com	YSC	Third Party

Messaging Service Specification

In this document

Related resources

Signaling threats: SS7 and beyond

A network operator's guide to differentiating in a digital era

Building a smooth, secure experience with SMS-based 2FA