Vonage API Help Center Vonage API Help Center

SIP

SIP 402 and 503 "Payment Required" Error Codes on Voice Calls
ObjectiveWhen making outbound voice calls using SIP Trunking, Programmab...
SIP Client Registration and Call Failure After Creating a Secondary API Secret
SymptomSIP client registration and outbound call initiation suddenly fai...
Inbound Call Failover Not Working in SIP Trunking
Symptom Inbound call failover is expected to automatically route calls t...
Why does my SIP endpoint reject the call with SIP 403 Forbidden?
SymptomWhen forwarding a call to my Vonage number to my SIP URI, the cal...
Is the Diversion header supported in SIP Trunking?
QuestionCan the Diversion header be added to a call forwarded to a SIP e...
No Audio In Programmable SIP IVR
Symptom An issue was happening for a user of the Voice API where no audi...
Does Vonage support Digest Authentication for inbound calls to a SIP endpoint?
Question Can I use Digest Authentication for inbound SIP calls? Applies ...
Is SIP REFER supported?
Question Can I transfer calls using SIP REFER? Applies To SIP REFER Voi...
How to Create a Redundant SIP-Forwarding Configuration
Objective Creating a redundant SIP-forwarding configuration in my Vonage...
Special Characters in Forward to SIP Address
Question Can I include _ or - within the SIP Address? Applies To Specia...
What does xxx SIP call status mean?
QuestionWhat do the various SIP response codes mean?Applies To SIP Error...
Can I call emergency services using Vonage SIP Trunking?
Question Is it possible to dial emergency services such as 999 or 911 us...
How can I connect a soft phone with Vonage SIP trunk to make outbound calls?
Objective Connecting a soft client with Vonage SIP trunk to make outboun...